Per feedback_mbp10_mandatory.md, MBP-10 + trades are mandatory inputs.
multi_fold_convergence now reads FOXHUNT_MBP10_DATA / FOXHUNT_TRADES_DATA
env vars, forwards them to train_baseline_rl as --mbp10-data-dir /
--trades-data-dir, and hard-fails if either path is missing.
Argo sanitizer-test + nsys-test templates set the env vars to PVC paths
/data/test-data/{mbp10,trades} and FOXHUNT_TEST_DATA points at
/data/test-data/ohlcv (PVC layout has lost+found/trades/mbp10/ohlcv as
top-level subdirs; the symbol ES.FUT lives under ohlcv/).
Without this, the smoke would silently fall back to tick-rule proxy
classification and validate a degraded model variant (no real OFI),
defeating the purpose of L40S validation. Audit doc updated per
Invariant 7.
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